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some numbers from Texas Tech
These are from SAE Paper #881874,from research done at Lubbock,Texas,and Lockheed,Marietta,Georgia full-scale wind tunnel.
*For wind-averaged conditions,their long bed Ford pickup achieved a drag minimum with both a 32" wing @ 8-degrees,and 28" wing @ 6-degrees.
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For their short bed pickup,the drag minimum occurred with both a 24" wing @ 8-degrees,and a 22" wing @ 10-degrees.
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Drag was always lower with a 1/2-tonneau,rather than a full tonneau.
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The long bed F-150 with 1/2-tonneau and wing combo achieved a 16.9% drag reduction,close to the 20% provided by the 'aeroshell.'
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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